Light bar



FIG. 1 is a view in perspective of a light bar showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof; and

FIG. 6 is a right end elevational view thereof, the left end elevational view being identical. 

The ornamental design for a light bar, substantially as shown and described. 